<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        .container {
        }
        .container .cart {
            width: 300px;
            margin: auto;
        }
        .container .title {
            background-color: lightblue;
            height: 40px;
            line-height: 40px;
            text-align: center;
            /*color: #fff;*/
        }
        .container .total {
            background-color: #FFCE46;
            height: 50px;
            line-height: 50px;
            text-align: right;
        }
        .container .total button {
            margin: 0 10px;
            background-color: #DC4C40;
            height: 35px;
            width: 80px;
            border: 0;
        }
        .container .total span {
            color: red;
            font-weight: bold;
        }
        .container .item {
            height: 55px;
            line-height: 55px;
            position: relative;
            border-top: 1px solid #ADD8E6;
        }
        .container .item img {
            width: 45px;
            height: 45px;
            margin: 5px;
        }
        .container .item .name {
            position: absolute;
            width: 90px;
            top: 0;left: 55px;
            font-size: 16px;
        }

        .container .item .change {
            width: 100px;
            position: absolute;
            top: 0;
            right: 50px;
        }
        .container .item .change a {
            font-size: 20px;
            width: 30px;
            text-decoration:none;
            background-color: lightgray;
            vertical-align: middle;
        }
        .container .item .change .num {
            width: 40px;
            height: 25px;
        }
        .container .item .del {
            position: absolute;
            top: 0;
            right: 0px;
            width: 40px;
            text-align: center;
            font-size: 40px;
            cursor: pointer;
            color: red;
        }
        .container .item .del:hover {
            background-color: orange;
        }
    </style>
</head>
<body>
<div id="app">
    <div class="container">
        <my-cart></my-cart>
    </div>
</div>
<script src="lib/vue.js"></script>
<script>


    // 标题组件
    let CartTitle = {
        template: `<div class="title">{{uname}}的商品</div>`,
        props:['uname']
    };
    // 商品列表
    let CartList = {
        methods:{
        },
        props:['items'],
        template: `
        <div>
            <div class="item" v-for="(item,index) in items" :key="item.id">
               <img :src="item.img" alt="alt">
               <div class="name">{{item.name}}</div>
               <div class="change">
                  <a href="" @click.prevent="$emit('change-num',{type:'reduce',id:item.id})">-</a>
                  <input type="text" :value="item.num" class="num" @blur="$emit('change-num',{type:'input',id:item.id,num:$event.target.value})">
                  <a href="" @click.prevent="$emit('change-num',{type:'add',id:item.id})">+</a>
               </div>
               <div class="del" @click="$emit('change-num',{type:'del',id:item.id})">x</div>
            </div>
        </div>
        `
    };
    // 商品结算
    let CarTotal = {
        props:['total'],
        template: `
            <div class="total">
                <span>总价:{{total}}</span>
                <button>结算</button>
            </div>
        `

    };
    // 注册全局组件
    Vue.component('my-cart',{
        methods:{
            changeNum(data){
                let item = this.list.find(e => e.id === data.id);
                if(!item){return;}
                switch (data.type) {
                    case 'reduce':
                        item.num <= 0 ? item.num = 0 :item.num--;
                        break;
                    case 'add':
                        item.num++;
                        break;
                    case 'input':
                        item.num = data.num;
                        break;
                    case 'del':
                        this.list = this.list.filter(e => e.id !== data.id);
                }
            },
        },
        template:`
            <div class="cart">
                <cart-title :uname="uname"></cart-title>
                <cart-list :items="list" @change-num="changeNum($event)"></cart-list>
                <cart-total :total="total"></cart-total>
            </div>
        `
        ,
        // 注册局部组件
        components:{
            'cart-title': CartTitle,
            'cart-list': CartList,
            'cart-total': CarTotal
        },
        data:function () {
            return {
                uname: '张三',
                list: [{
                    id: 1,
                    name: 'TCL彩电',
                    price: 1000,
                    num: 1,
                    img: 'img/a.jpg'
                },{
                    id: 2,
                    name: '机顶盒',
                    price: 1000,
                    num: 1,
                    img: 'img/b.jpg'
                },{
                    id: 3,
                    name: '海尔冰箱',
                    price: 1000,
                    num: 1,
                    img: 'img/c.jpg'
                },{
                    id: 4,
                    name: '小米手机',
                    price: 1000,
                    num: 1,
                    img: 'img/d.jpg'
                },{
                    id: 5,
                    name: 'PPTV电视',
                    price: 1000,
                    num: 2,
                    img: 'img/e.jpg'
                }]
            }
        },
        computed:{
            total(){
                return this.list.reduce((sum,c) => sum+(c.price*c.num),0);
            }
        }
    });
    let app = new Vue({
        el: "#app",
        data:{

        }
    });

</script>
</body>
</html>